Don't close the Preview window if we close an unrelated Editor

src/app/ui/document_view.cpp

@@ -65,22 +65,25 @@ public:
 
   // EditorObserver implementation
   void dispose() override {
-    App::instance()->getMainWindow()->getPreviewEditor()->updateUsingEditor(NULL);
+    PreviewEditorWindow* preview =
+      App::instance()->getMainWindow()->getPreviewEditor();
+
+    if (preview->relatedEditor() == this)
+      updatePreviewEditor(nullptr);
   }
 
   void onScrollChanged(Editor* editor) override {
-    if (current_editor == this)
-      App::instance()->getMainWindow()->getPreviewEditor()->updateUsingEditor(this);
+    updatePreviewEditor(this);
   }
 
   void onAfterFrameChanged(Editor* editor) override {
-    App::instance()->getMainWindow()->getPreviewEditor()->updateUsingEditor(this);
+    updatePreviewEditor(this);
 
     set_current_palette(editor->sprite()->palette(editor->frame()), true);
   }
 
   void onAfterLayerChanged(Editor* editor) override {
-    App::instance()->getMainWindow()->getPreviewEditor()->updateUsingEditor(this);
+    updatePreviewEditor(this);
   }
 
   // EditorCustomizationDelegate implementation
@@ -161,6 +164,11 @@ protected:
   }
 
 private:
+
+  void updatePreviewEditor(Editor* editor) {
+    App::instance()->getMainWindow()->getPreviewEditor()->updateUsingEditor(editor);
+  }
+
   bool isKeyActionPressed(KeyAction action) {
     if (Key* key = KeyboardShortcuts::instance()->action(action))
       return key->checkFromAllegroKeyArray();

src/app/ui/preview_editor.cpp

@@ -175,6 +175,7 @@ PreviewEditorWindow::PreviewEditorWindow()
   , m_playButton(new MiniPlayButton())
   , m_refFrame(0)
   , m_aniSpeed(1.0)
+  , m_relatedEditor(nullptr)
 {
   child_spacing = 0;
   setAutoRemap(false);
@@ -297,12 +298,15 @@ void PreviewEditorWindow::updateUsingEditor(Editor* editor)
 {
   if (!m_isEnabled || !editor) {
     hideWindow();
+    m_relatedEditor = nullptr;
     return;
   }
 
-  if (editor != current_editor)
+  if (!editor->isActive())
     return;
 
+  m_relatedEditor = editor;
+
   Document* document = editor->document();
   Editor* miniEditor = (m_docView ? m_docView->getEditor(): NULL);
 

src/app/ui/preview_editor.h

@@ -28,6 +28,8 @@ namespace app {
     void updateUsingEditor(Editor* editor);
     void uncheckCenterButton();
 
+    Editor* relatedEditor() const { return m_relatedEditor; }
+
   protected:
     bool onProcessMessage(ui::Message* msg) override;
     void onClose(ui::CloseEvent& ev) override;
@@ -45,6 +47,7 @@ namespace app {
     MiniPlayButton* m_playButton;
     doc::frame_t m_refFrame;
     double m_aniSpeed;
+    Editor* m_relatedEditor;
   };
 
 } // namespace app